Improvement in steam-boilers



T. GREEK. STEAM BOILER.

No. 11,220. Patented July '4, 1854.

UNITED STATES PATENT OFFICE.

THOMAS GREER, OF PHILADELPHIA, PENNSYLVANIA.

IMPROVEMENT IN STEAM-BOlLERS.

To all whom it may concern.-

Be it known that I, THOMAS GREEK, of Ihiladelphizn'in the county of Philadelphia and State of Pennsylvania, have invented a new and Improved Tubular Fire -Box for Boilers; and I do hereby declare that the following is a full and exact description thereof, reference being had to the accompanying drawings and the letters of reference marked thereon. I

llhe same'letters refer to like parts.

To enable others skilled in the art to'make and use'my invention, I will describe its construction and operation.

I do not confine niysclf'to any particular .form of boiler, though I prel'er'the one here represented. v

Figure 1 is a front view of the outside of the boiler. Fig. 2 is aside view otthe same. Fig. 3 is a birds-eye view. Fig. 4 is a sectional view through U V. Fig. 5 isa sectional view through \V X. Fig. (3 is a sectional view through Y Z.

a is the outer shell.

b is the inner shell.

0 is the angular tubes.

(Z is the horizontal tubes.

6 is the grate-bars.

' f is the lire-door.

g is the ash-pit.

his the smoke-pipe.

11 is the hand or man holes and caps.

j is the steam-chamber.

In constructing my boilerI first form the innershellb. Through this shellfrom each side and near the top to the opposite sides and near the bottom I pass a series of tubes 0 at an angle of about forty-five degrees. This arrangement leaves aspace between the tubes c and the top oft-he shell I) and also on each side of the shell b and the upperen'd of one,

tier and the lower end of the other tier of tubes 0. Through these spaces I pass a series of horizontal tubes d from front to rear, the said tubes all being secured to the shell in the usual waythat is to say, by ferrule and calking.

The outer shell 0:, though larger, is shaped similar to the inner shell b, except at the top, where the arch is thrown up to form the steam-chamberj. The two shells are united by flanges or any other preferred method a little below the gi-atebars 6, thus forming a water-space entirely around the shell b, ex cept at the bottom'or fire-space represented by the grate-bars a. New by keeping the water above the topof the shell I) the tubes 0 and (Z will also be kept full, thusallowing the fire to act directly upon ever tube and also on the whole inner surface of the shell I). This arrangement gives a very large firesurfaec in a comparatively small space, and the angular-tubes c and water-space between the shells a and b allow a free and rapid cireulation of the steam and water.

By removing the caps from the hand or man holes tithe tubes 0 and (Z and the space between the shells at and b may be cleaned and the tubes repaired or replaced without difliculty.

I am aware that vertical, coiled, and horizontal tubes have been used in boilers, andI therefore do not claim them; but What I do claim as new, and desire to seon re by Letters Patent, is-

l. A series of angular tubes arranged and for the purpose as herein specified.

2. The horizontal tubes, in' combination with the angular tubes.

THOMAS 

